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The proximal ligamentous component of the triangular fibrocartilage complex
1Department of Orthopaedic Surgery, Keio University, Tokyo, Japan.
Journal of Hand Surgery (Edinburgh, Scotland)
|September 19, 2000
Summary
The proximal ligamentous component of the triangular fibrocartilage complex (TFCC) acts as a radioulnar ligament. Its fibers adjust length during forearm rotation, with portions near the ulnar fovea showing isometric behavior.
Area of Science:
- Anatomy
- Biomechanics
- Orthopedics
Background:
- The triangular fibrocartilage complex (TFCC) is crucial for forearm stability and rotation.
- Understanding the proximal ligamentous component's role in forearm biomechanics is essential for diagnosing and treating wrist injuries.
Purpose of the Study:
- To anatomically investigate the proximal ligamentous component of the TFCC.
- To analyze changes in ligament length during forearm rotation.
- To elucidate the functional role of TFCC components in radioulnar motion.
Main Methods:
- Anatomical dissection of 15 fresh-frozen cadaver hand-forearm specimens.
- Preservation of the complete 3D TFCC structure during analysis.
- Measurement of ligament length changes using fine wires during forearm rotation (pronation-supination).
Main Results:
- The proximal TFCC component has dorsal, central, and palmar portions; the central portion was inconsistent.
- Three morphological types (fan, V, funnel) were observed.
- Dorsal and palmar portions exhibited varied length changes during rotation, with some portions showing near-isometric behavior when close to the ulnar fovea's rotational axis.
Conclusions:
- The proximal TFCC component functions as a true radioulnar ligament.
- Isometric and eccentric fibers within the TFCC cooperate during forearm rotation.
- Attachment proximity to the ulnar fovea influences ligament extensibility and function.
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